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Ok, as some know, we lost 4 out of a litter of 5. I have never had this happen before. This pup is still going strong. VERY active and nurses a LOT. However, after 8 days he still has not gained any weight. I have started supplementing his nursing with puppy formula a couple of times a day. I wonder since there is only one pup if the mother's milk is drying up? The amount of time he spends voraciously nursing, he should be gaining weight. I am wondering about other supplements that may be added. Any personal experience?